<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="loginOut">退出</el-button>
    </el-header>
    <!-- 页面主体 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse?'64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eff"
          unique-opened
          :collapse='isCollapse'
          :collapse-transition='false'
          router
          :default-active='activePath'
        >
          <!-- 一级菜单 -->
                  <!-- :index不让多个一级菜单同时展开 -->
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item :index="'/' + subItem.path" 
                          v-for="subItem in item.children" 
                          :key="subItem.id"
                          @click="saveNavState('/' + subItem.path)">
              <i class="el-icon-menu"></i>
              <span>{{subItem.authName}}</span>
            </el-menu-item>

          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧页面内容 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  created () {
    // 获取所有的菜单
    this.getMenuList()
    // home刷新页面时，立即让其获取到之前的activePath，左侧菜单进行激活
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  name: 'Home',
  data() {
    return {
      // 左侧菜单数据
      menuList:[],
      iconsObj:{
        '125':'el-icon-s-custom',
        '103':'el-icon-receiving',
        '101':'el-icon-s-shop',
        '102':'el-icon-s-order',
        '145':'el-icon-s-marketing'
      },
      // 是否折叠
      isCollapse:false,
      // 被激活的链接地址
      activePath:''
    }
  },
  components: {},
  methods: {
    loginOut() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取左侧菜单数据
    async getMenuList(){
      const {data:res} = await this.$http.get('menus')
      if(res.meta.status !== 200) return this.$messaage.error(res.meta.msg)
      this.menuList = res.data
      // console.log(res)
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse(){
      this.isCollapse = !this.isCollapse;
    },
    // 保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath = activePath
    }
  },
  mounted() {},
}
</script>

<style lang='less' scope>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu{
    border-right: 0px;
  }
}
.el-main {
  background-color: #eaedf1;
}
.inconfont{
  margin-right: 10px;
}
.toggle-button{
  background-color: #4a5064;
  color: #fff;
  font-size: 10px;
  line-height: 24px;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>